1 . Season chicken with Mediterranean spice and place on grill. Baste chicken with balsamic vinaigrette and turning once, until cooked fully (about 2 minutes per side). Season chicken with remaining teaspoon Mediterranean spice and remove from grill then set aside.

2. Place shredded romaine and red onion in a medium sized bowl; lightly add red-wine vinaigrette and toss. Evenly divide the mixture on butter lettuce leaves and drizzle each with 1 teaspoon tzatziki.

3. Top each taco with 1 piece of chicken and garnish with chopped tomatoes, feta cheese and olives. Feel free to add any other spices to your liking, and enjoy!